This paper is dealt with the RDB(Restricted Difference Basis)
problem .Let Kn be a complete graph of order n and k(n) be the number
of all the edges of Kn .Miller proved that for n large enough the
number f(n) of edges that can be labeled continuously in Kn is
about one third of k(n) .In this paper we establish a 'x link'
marks distribution model of RDB ruler .By using the model the
following results are proved:
f(n)>=k(n+1)/2 for n>=3;
f(n)>=k(n+2)/2 for n>=9;
f(n)>=k(n+3)/2 for n>=33;
f(n)>=k(n+4)/2 for n>=409.
Thus the Miller's conclusion is improved.